very slow query

this query works, but it takes upwards of 20 seconds to run on a quad core dedi… how can i optimize this?

$slides=get_posts(
	array('post_type' => 'any', 'numberposts' => 5, 'orderby' => 'date', 'order' => 'desc', "tax_query" =>
		array(
				"relation" => "OR",
				 array(
					"field" => "id",
					"terms" => array(36),
					"taxonomy" => "category",
					"operator" => "IN"
				),
				array(
					"field" => "id",
					"terms" => array(36),
					"taxonomy" => "music-categories",
					"operator" => "IN"
				),
				array(
					"field" => "id",
					"terms" => array(36),
					"taxonomy" => "video-categories",
					"operator" => "IN"
				),
				array(
					"field" => "id",
					"terms" => array(36),
					"taxonomy" => "mixtape-categories",
					"operator" => "IN"
				)
			)
		)
);